Fall Out Boy star Pete Wentz says kissing Ashlee Simpson is like kissing his best friend.

The bassist - who is rumored to be engaged to Ashlee, the younger sister of Jessica Simpson - shares a deep connection with his girlfriend that goes beyond mere lust.

He told People magazine: "We're past the honeymoon period. The truth is, it's crazy to be able to kiss your best friend. It's just a really awesome thing."

Wentz also dismissed accusations the couple's over-the-top displays of affection are all just an act.

He added: "People like to make our relationship seem different than to what it is. People will say, 'No one holds hands that much.' But I'm like, 'Why would you not want to touch the person that you're in love with?'"

The songwriter was in Las Vegas over the weekend to unveil a wax sculpture at Madame Tussauds to promote the launch of the new Xbox 360 game 'Halo 3' and perform with his band at the MTV Video Music Awards.

However, he confessed he did not enjoy spending time in the gambling capital.

Wentz said: "When I'm here for more than eight hours I feel like my soul is dwindling."

Wentz added the couple prefer to "hang out" in their Southern California home "90 percent of the time because nobody bugs you over there."

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